Turbo C++/Borland C++ (with Object Windows library) was the best C++ IDE on MS-DOS in the early/mid 90's. All their tools were excellent. They were leading the industry in the usage of C++ on PCs and should have built upon that advantage; but then they lost it all to MS Visual C++ (with MFC library) when Windows came along.
It was one of the earliest and best textbook case of management screwing up a technical company.
I went to a talk by MS Visual C++ product manager, years ago. IIRC he said that Borland did all sorts of really difficult stuff to make their C++ compiler better and more standard compliant, whereas MS concentrated on easier and more marketable stuff like wizards.
It was one of the earliest and best textbook case of management screwing up a technical company.